Improve Help Command to adjust the output width according to terminal width

Description

Inside alluxio.shell.command.HelpCommand#printCommandInfo, the width of help message printed is constant.

This JIRA aims to address the TODO in the following code in shell/src/main/java/alluxio/shell/command/HelpCommand.java to change width dynamically.

Environment

None
Fixed
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Assignee

Bin Fan

Reporter

Bin Fan

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